| Year | Count |
|---|---|
| 1990 | 5 |
| 1991 | 6 |
| 1992 | 6 |
| 1993 | 11 |
| 1994 | 23 |
| 1995 | 33 |
| 1996 | 20 |
| 1997 | 10 |
| 1998 | 49 |
| 1999 | 55 |
| 2000 | 51 |
| 2001 | 68 |
| 2002 | 111 |
| 2003 | 111 |
| 2004 | 193 |
| 2005 | 293 |
| 2006 | 392 |
| 2007 | 519 |
| 2008 | 843 |
| 2009 | 1,026 |
| 2010 | 1,233 |
| 2011 | 1,528 |
| 2012 | 2,073 |
| 2013 | 3,072 |
| 2014 | 21 |
| 2014 | 3,237 |
| 2015 | 5 |
| 2015 | 3,726 |
| 2016 | 15 |
| 2016 | 3,818 |
| 2017 | 4,149 |
| 2018 | 4,348 |
| 2019 | 8 |
| 2019 | 3,748 |
| 2020 | 2,885 |
| 2021 | 5 |
| 2021 | 3,165 |
| 2022 | 6 |
| 2022 | 2,625 |
| 2023 | 2,320 |
| 2024 | 6 |
| 2024 | 2,320 |